Lead DBA Interview Questions and Answers

My name is John Smith. I improved the slow old system by optimizing queries, upgrading hardware, and implementing performance tuning techniques.

• Optimized database queries by rewriting them and adding appropriate indexes

• Upgraded hardware to improve system performance

• Implemented performance tuning techniques such as caching and query optimization

• Identified and resolved bottlenecks in the system

• Implemented database monitoring and alerting to proactively address performance issue...read more

A relational database is a type of database that organizes data into tables with rows and columns.

• A relational database is based on the relational model, which uses tables to store and organize data.

• Tables consist of rows and columns, where each row represents a record and each column represents a field or attribute.

• Data in a relational database is structured and can be easily accessed and manipulated using SQL (Structured Query Language).

• Relationships between tables are esta...read more

SQL stands for Structured Query Language, used to manage and manipulate relational databases.

• SQL is a programming language used to manage and manipulate relational databases.

• It is used to create, modify, and query databases.

• SQL is used in various applications such as web development, data analysis, and business intelligence.

• Examples of SQL-based database management systems include MySQL, Oracle, and Microsoft SQL Server.

There are mainly four types of databases: relational, NoSQL, column-family, and document.

• Relational databases store data in tables with predefined relationships between them.

• NoSQL databases are non-relational and can handle unstructured data.

• Column-family databases store data in columns instead of rows.

• Document databases store data in documents, usually in JSON format.

• Examples of relational databases include MySQL and Oracle.

• Examples of NoSQL databases include MongoDB and Cas...read more